Neutron diffraction study of magnetic structure and successive 5f electronic transition in the itinerant antiferromagnet NpRh Ga5

Shintaro Jonen, Naoto Metoki, Fuminori Honda, Koji Kaneko, Etsuji Yamamoto, Yoshinori Haga, Dai Aoki, Yoshiya Homma, Yoshinobu Shiokawa, Yoshichika Onuki

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23 Citations (Scopus)

Abstract

Neutron diffraction experiments have been carried out in a single crystal of NpRh Ga5 in order to reveal the magnetic structure and 5f electronic state. This material exhibits two successive antiferromagnetic transitions at TN1 =36 K and TN2 =33 K. An A-type antiferromagnetic structure with the propagation vector q = (0 0 1 2), appears below TN1. We found a remarkable change in the moment direction at TN2, namely, the Np moment is parallel to the c axis for TN2 <T< TN1 (AF1), but parallel to the 1 1 0 direction in the basal plane for T< TN2 (AF2). The magnitude of the magnetic moment also exhibits a remarkable and discontinuous change at TN2, indicating the moment reorientation is associated with a change of the 5f electronic state. This electronic transition might be the consequence of the competition between the magnetic and/or quadrupolar interaction in the low-moment (AF1) and high-moment (AF2) states. The observed magnetic form factor indicates a dominant contribution from the orbital moment, with a small reduction from the Np3+ free ion state.

Original languageEnglish
Article number144412
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number14
DOIs
Publication statusPublished - 2006 Oct 23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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